Silica-mullite bricks are divided into three grades: GM1650, GM1600, and GM1550 according to the load softening temperature parameter.

Silica-mullite bricks have the following characteristics:

① The product structure is dense and has good wear resistance. The structure of silica-mullite brick products is dense, and the volume density is generally 2.55~2.65g/cm³. Due to its excellent density, strength and wear resistance, it is widely used in cement rotary kiln secondary firing belts, filter belts and other parts.

② High load softening temperature and good high temperature performance. The load softening temperature of silica-mullite bricks is above 1450℃, and the highest can reach above 1650℃.